JP2632455B2 - Circular thickener - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The disclosed technology relates to a thickener structure in which a slurry such as a processing liquid or a waste liquid in a production process of a factory is settled by gravity sedimentation by gravitational sedimentation and a clarified liquid is discharged from an upper part. Belongs to.

[0002]

2. Description of the Related Art As is well known, pollution problems and environmental problems have been highlighted in recent years with the improvement of citizens' lives and the rise of industrial society, and various solid-liquid separation technologies have been actively developed to deal with these problems. Research and development have been pursued, and in particular, harmony between industrial development and civil life has been pursued, and technologies for preventing pollution against air and water pollution have become a priority technology.

[0003] Since various factories and the like inevitably involve water treatment technology, they are often operated in the river basin or near the shore. For this reason, factory effluents are conventionally drained by rivers and shores in a so-called draining method. However, recently, the factory effluent from the sink has caused a significant pollution problem,
There has been a strong demand for non-polluting treatment of factory effluents, and various wastewater treatment techniques have been developed.

[0004] In most cases, the factory effluent is a kind of slurry, and therefore, naturally, a technology for separating sludge from liquid and solid can be considered in the treatment thereof. From the flow of technical development, etc., the sorting method by gravity sedimentation has been regarded as the primary mode from the viewpoint of mass processing, and it has been the mainstream until now,
For example, as shown in FIG. 12, a so-called clarifier type thickener 1 has been used for a long time, and a liquid passage pipe 3 is set up at the center of a cylindrical casing in the upper half and a tapered cone type tank casing 2 in the lower half. A slurry stock solution is supplied, discharged from the lower portion, and stirred by the stirring blades 4 to precipitate the sludge slurry by gravity sedimentation, and the clarified solution overflows to the overflow weir 5 at the upper portion to remove the floating floc. A technique has been used in which sedimentation occurs over time and the sludge is discharged from the outlet 6 together with the sludge.

[0005]

However, in such a thickener, as shown in FIG. 12, the stirring blades 4 at the lower portion of the tank casing 2 agitate floating flock, sludge, etc., so that a smooth gravitational settling action is achieved. Is difficult to be promoted, and there is a problem that it is inefficient in practical use. Therefore, a lateral-flow type inclined plate type thickener has been developed, and for example, a practical type as disclosed in Japanese Patent Application Laid-Open No. 53-90066 is disclosed. Something was developed.

If such a circular thickener is made large, the gap between the inclined plates extending in the inclined direction along the liquid flow pipe becomes fan-shaped, and the sedimentation function of the fine particles by the laminar flow of the transverse flow type. There is a disadvantage that it is difficult to use a large, large-capacity circular thickener because of the hindrance.

In this type of thickener of the horizontal flow type inclined plate type, the supplied slurry is caused to flow laterally in a floating manner, and a large number of inclined plates are provided side by side through a predetermined minute gap. Of the tank casing is designed to have a rectangular cross section, and therefore the slurry is supplied from one side of the tank casing. However, since a method of flowing to the other side is employed, it is difficult to effectively utilize the cross section of the tank casing in the entire region.

In addition, there is a problem that the space occupied by the thickener in the plant is widened, and it is difficult to achieve a large capacity in terms of pressure resistance and the like.

Therefore, it is originally not desirable to design the thickener to have a circular shape, to supply the slurry to the central portion, to generate a laminar flow toward the periphery, and to cause gravity sedimentation and sedimentation in the entire region. However, as shown in FIG. 13, a liquid supply pipe 3 for slurry supply is erected at the center of the circular tank casing 2 of the circular thickener 1 ′, and a slanting plate 7 is radiated from the side of the liquid supply pipe 3 in the radial direction. , 7,... Are arranged to gradually narrow the gaps between the inclined plates 7 in each stage to promote the precipitation of fine particles, as shown in the invention of Japanese Patent Publication No. 56-26449. In contrast to the function shown in FIG. 13, the circumferential gap between the inclined plates 7 is increased toward the outside and the gap is narrowed toward the end of the inclined plate 7 to promote the sedimentation of fine particles. And activated sludge Sludge to the inclined plate 7 there is a problem that to difficult to cleaning and maintenance servicing deposited in slurry and the like.

Even if a pair of inclined plates 7, 7... Can be arranged to make the gap small, even if the inclined plates are deformed or distorted due to mounting work or thermal behavior, etc. When the particles come into contact with, for example, the sedimentation of the particles is hindered.

Further, as shown in FIG. 13, basically, the design is such that it is almost impossible to integrally arrange the inclined plate 7 having a predetermined inclination angle in the circumferential direction inside the circular tank casing 2. There was a neck.

Therefore, as shown in FIG. 14, a film-shaped inclined film 7 'made of a soft synthetic resin is provided, the upper side of which is engaged with a bar-shaped support member 8, and the lower end thereof is attached to a bar-shaped weight 9. The tilted film 7 'is locked and caused to appear in a suspended state by gravity through another supporting body 8' through a predetermined intermediate portion, so that the inclined film 7 'is not deformed or distorted over time. A technique that does not hinder the cross-flow laminar flow of the settled fine particles even if the inclined film 7 'is obliquely cut through a minute gap is disclosed in, for example,
It has been developed as in the invention of -67267.

However, in the case of such a gradient film system, a circular thickener also has a fan-shaped space in a plan view in a circumferential arrangement, and has the same problem as the above-mentioned inclined plate system.

[0014]

SUMMARY OF THE INVENTION The object of the invention of this application is to solve the problem of the small-diameter thickener according to the prior art described above, and it is intended to solve the problem through a minute gap adjacent to an inclined plate in a circular thickener. The technical problem to be solved is the problem of the bottleneck in the arrangement of the film, and a film-shaped flexible inclined film is suspended at a predetermined angle via a weight, and the minute inclined film in the circumferential direction in the circular tank casing is reduced. It is an object of the present invention to provide an excellent circular thickener that is advantageous in the field of application of solid-liquid separation technology in various industries by arranging a large number of sets through gaps.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the constitution of the invention of the present application for solving the above-mentioned problems is to solve the above-mentioned problems. When a slurry such as is settled and separated into solid and liquid, a flow pipe for the undiluted solution is erected at the center of the circular tank casing, and the synthetic resin is flexible from the circumference of the liquid pipe to the inner surface of the tank casing. When the inclined films of the above film are installed in the circumferential direction so as to be inclined circumferentially with a predetermined small gap therebetween, a bar-shaped or linear support for each inclined film is not allowed to pass therethrough. The liquid tube is inclined at a predetermined angle in the circumferential direction with respect to the radial direction from the center line of the liquid tube, and the lower support is parallel to the upper support, that is, from the center line of the liquid passage tube. Inclined at a predetermined angle in the circumferential direction with respect to the radiation direction Alternatively, to be parallel,
With respect to the inclined film, a weight is provided at the lower end, and between the upper and lower supports, tension is always applied, and there is no deformation or distortion between adjacent inclined films, ensuring a small gap as set in the initial setting. In addition, in the radial direction, a cantilever-type support extending from the inner surface side of the tank casing can form an inclined film that overlaps in the circumferential direction. The number of the adjacent inclined films gradually increases,
The stock solution that is supplied from the flow pipe so that the gap between them can be made sufficiently small and rises from the lower side to the upper side gradually becomes sedimented with floating flocs and fine particles in the process of forming a laminar flow in the radial direction. As the projected area of the inclined membrane on the vertical surface increases, the sedimentation efficiency by sedimentation and separation is improved, and the upper clarified liquid overflows and is discharged from the overflow weir provided on the upper side surface of the tank casing. The sedimentation slurry such as sludge is discharged from the lower part and the continuous sedimentation and sedimentation function is always maintained according to the initial design.In maintenance inspection, etc., the inclined film is suspended, so it is easily pulled up to wash sludge etc. Has taken technical measures to ensure smoothness and to ensure that the function as a thickener is maintained.

[0016]

Next, an embodiment of the invention of this application will be described with reference to FIGS.

The same parts as those in FIGS. 12 and 13 are described using the same reference numerals.

In the embodiment shown in FIGS. 1 to 5,
Reference numeral 10 denotes a sedimentation mechanism which forms the center of the circular thickener which constitutes the gist of the invention of this application, and which is the center of the upper cylindrical type lower tapered cone type tank casing 2 of the circular thickener 1 of the general mode shown in FIGS. An undiluted solution is supplied from an upper portion of a slurry such as a factory waste liquid inserted into the tank through a flow pipe 3 for undiluted solution supply, and the slurry discharged toward the lower portion of the tank casing 2 precipitates sludge having a large particle diameter. Then, it floats to the side and flows over the entire surface in the direction of an overflow weir provided outside the upper portion of the tank casing 2 as a laterally-flowing laminar flow.

The upper and lower flanges 11 and 11 'having a ring shape are fixed to predetermined portions of the liquid passage tube 3 in the vertical direction by welding or the like.

It should be noted that the flanges 11 and 11 'are bolted so as to be detachable from the liquid passage tube 3 for maintenance, inspection and cleaning, which will be described later, without any difficulty for those skilled in the art. Within the scope of the change.

The female screw holes 12, 12... Of a predetermined small size are threaded in the circumferential direction of each of the flanges 11, 11 ', and the bracket 1 having a fitting hole 13 formed in an intermediate portion.
4 can be fixed by screwing a weld bolt 15 provided on the bracket 14.

Such an arrangement is based on the tank casing 2
The same structure is applied to the ring-shaped flange 11 '' provided at the corresponding position in the vertical direction of the above, and the inclined film 7 'of a flexible film made of a predetermined synthetic resin such as vinyl having a set film thickness. A bar-shaped upper support 8 inserted through the upper edge portion and inserted into the lower end is removed from the hole 13 of the bracket 14 provided on the upper flange 18 and the bracket 13 of the flange 11 ″ inside the tank casing 2. The end is inserted,
Further, the lower support member 8 ', which is inserted and fixed to the bracket 13 of the lower flange 11', is placed on the lower support member 8 'so that the flat portion 71 between the upper support member 8 and the lower support member 8' and the lower support member 8 '. An inclined film 7 'is formed so that a vertical portion 71' between the support 8 'and the weight 9 is formed, and the whole is inclined by a set angle in the circumferential direction by the weight 9; The adjacent inclined film 7 ',
The small gap d between 7 'is formed as designed.

As shown in FIG. 3, FIG. 4, and FIG. 5 (in FIG. 3, for convenience of illustration, four inclined films 7 'are shown at intervals of 90 degrees. As shown in FIG. 4, the upper supporting body 8 is disposed on the vertical surface from the center line of the liquid passage 3 to the radial direction with respect to the flange 11, as shown in FIG. And α, and extend at an angle of β with a plane from the center line of the liquid passage tube 3 to the radial direction at the lower flange 11 ′. Therefore, none of the upper and lower supports 8, 8 'is parallel to the vertical plane extending from the center line of the liquid passage tube 3 to the radial direction, and therefore, the upper and lower supports as shown in FIG. In the upper part, the inclined film 7 ′ suspended in the respective directions rotates in one direction (A) at the upper part, and at the lower part in the lower part. As shown in (b), the film is rotated in the opposite direction, and as shown in FIG. 11, the upper inclined surface 71 of the inclined film 7 is entirely inclined in parallel with the circumferential direction, and the lower vertical surface 71 'is drooping. The upper and lower supports 8, 8 ′ are radially twisted with respect to the plane formed from the center line of the liquid passage 3 to the upper and lower supports 8, 8 ′. Depending on how to take ', a large twist angle is formed as shown in FIG. 5, and as shown in FIG.
The inclined arrangement of the inclined film 7 'in the circumferential direction is formed in a swirling state. Therefore, as described above, the area of the inclined film, that is, the projected area is increased, so that the sedimentation efficiency of the particles can be significantly improved.

Therefore, the upper and lower supports 8, 8 'are each inclined at a predetermined angle in the circumferential direction with respect to a vertical plane formed in a radial direction from the center line of the liquid passage tube 3, respectively.
It may be parallel or non-parallel to each other, and therefore, the inclined films 7 ′ suspended between the upper and lower supports 8, 8 ′,
7 'are mutually parallel planes, but each of the vertical planes formed radially from the center line of the liquid passage tube 3 can be formed in a cross section intersecting with the vertical plane or a twist plane. , The choice is the scope of the design change.

Thus, even if the upper and lower supports 8, 8 'are arranged in parallel or non-parallel, each inclined film 7 suspended between them by a predetermined angle in the circumferential direction is suspended between them. The gap d between the 'and 7' is of a circular array structure, the gap on the upper liquid pipe 3 side is narrower, and the closer to the tank casing 2 side, the wider the gap d. In the process in which the slurry discharged from the lower end of the liquid pipe 3 floats, is laminarized as a lateral flow, and flows, the flow velocity gradually decreases, and therefore, the gap d between the inclined films 7 ', 7' becomes narrower. This is not preferable for the sedimentation effect of the floating blocks of the fine particles. In such a gradient membrane system, it is inherently desired that the gap between the gradient membranes is essentially narrowed in accordance with the flow, so as shown in FIG. From the side of the liquid pipe 3 to the outside or the inner surface of the tank casing 2 The support members 8 and 8 'are extended in a cantilever manner inward from the inner side of the tank casing 2 so that the number of steps set in the circumferential direction overlaps from the middle part in the radial direction to the inner surface of the tank casing 2. It is possible to adopt a design that makes the gap d between the inclined films 7 ′, 7 ′ as narrow as possible by increasing the density.

In the above configuration, the slurry supplied to the tank via the liquid flow pipe is a process in which the slurry of the undiluted solution discharged from the lower part of the liquid flow pipe 3 floats up and flows as a laminar lateral flow. In the process of flowing from the central portion to the peripheral portion, the sedimentation function and the like of fine particles such as buoyant flocs can be sufficiently promoted.

The clarified liquid in which the fine particles have settled is discharged to a predetermined extent by an overflow weir provided on the upper surface of the outer surface of the stock solution, and the settling slurry such as sludge is appropriately discharged from the discharge port at the lower part of the tank to the next step. Discharge for processing.

In FIG. 7, two inclined films are provided in the circumferential direction.
Although a mode in which three or more stages are overlapped is shown, the number of the gradient films is increased as the peripheral portion is increased to four or more stages so that the gap between the stock solutions can be increased as much as possible. It is a matter of design change to narrow and further enhance the settling function of the microparticles.

FIG. 8 shows the three-dimensional relationship between the inclined films 7 'shown in FIG.

Therefore, as shown in FIG. 9, the inclined films 7 ', 7'
7 ′... Can be not only a single sheet extending form from the liquid passage pipe 3 to the tank casing 2, but also a radially multi-step inclined film which overlaps with each other in the circumferential direction.

As described above, even in a circular thickener in which the tank casing is circular and the center of which is provided with a flow pipe for supplying a stock solution of the slurry, a large number of inclined plates having an inherently excellent sedimentation / sedimentation function are formed. It can be arranged through a minute gap, and by forming a film-shaped inclined film, deformation, distortion, wrinkles, etc. do not occur, the gap between them can be made extremely small, and the sedimentation function More can be promoted.

Further, by increasing the inclination angle of the inclined film, the projected area thereof can be increased, and the precipitation efficiency can be proportionally improved.

It should be noted that the embodiments of the invention of this application are not limited to the above-described embodiment. For example, the liquid passage tube is of a double cylinder type, and the outer cylinder is rotatable in the circumferential direction with respect to the inner cylinder. The gradient film of each embodiment described above is disposed on the outer cylinder,
For the lower support, the base is fixed to the inner cylinder side, and for the upper support, the base is fixed to the outer cylinder. Various modes such as inclining at a predetermined angle in the direction can be adopted.

Further, it is a matter of course that the support can be of a wire type using a wire or the like instead of a bar in terms of design change.

The object of application is not limited to slurry of various factory wastewaters, but it can be used for slurry treatment of foods, agriculture, chemistry, industry and the like.

[0036]

As described above, according to the invention of this application, basically, in a thickener for performing solid-liquid separation by sedimentation and settling of a slurry such as a treatment liquid or a waste liquid in a production process of a factory , the shape of the thickener is similar to that of a circular thickener. By doing so, there is an advantage that the connection with peripheral equipment in the plant is good, the pressure resistance is large, the capacity can be increased, and a large amount of processing can be performed, and therefore, a very large effect can be obtained in the slurry processing in pollution processing.

In this circular thickener, a predetermined number of flexible film-shaped inclined films are arranged in the circumferential direction from the liquid passage pipe inserted at the center to the inner surface of the tank casing. In addition, the advantages of the inclined plate type thickener can be fully utilized, and an excellent effect that the sedimentation of the fine particles can be promoted by the laminar flow of the laterally flowing type can be achieved.

Further, the inclined film is formed by using a flexible film and suspending the inclined film in an inclined manner from the upper support to the intermediate support via the weight at the lower end thereof. Even if the gap is made to be a minute gap, there is no distortion or deformation over time, and an excellent effect that the sedimentation function for particles can be sufficiently maintained without contacting or interfering with each other. Is played.

Further, since the inclined film is made of a flexible sheet, it can be pulled up and taken out of the thickener when performing a regular or irregular cleaning process maintenance and inspection and the like in order to adopt a hanging method by a weight. Since this operation is extremely easy and can be performed efficiently, resetting can be performed in a short time, and an excellent effect that the function of the thickener is immediately restored is exhibited.

Since the inclined film crosses the opposite surfaces of the upper and lower supports of the inclined film from the center line of the liquid pipe in the radial direction, the inclined film is formed around the peripheral surface. By being able to incline at a predetermined angle in the direction, an excellent effect is exhibited in which the function of promoting the sedimentation of the inclined plate system for the intrinsic fine particles increases in proportion to the enlargement of the projected area of the inclined film.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of a main part of an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is an enlarged partial plan view of a main part of the partial mechanism.

FIG. 4 is a schematic plan view in which a support is attached to a liquid passage tube.

FIG. 5 is a schematic plan view in which a support is attached to a liquid passage tube.

FIG. 6 is a schematic plan view of a gradient film arrangement.

FIG. 7 is a plan view of another embodiment.

FIG. 8 is an enlarged perspective view of a part of the inclined film arrangement in FIG. 7;

FIG. 9 is a schematic plan view of another embodiment.

FIG. 10 is a schematic perspective view of an inclined film at the beginning of one process.

FIG. 11 is a schematic perspective view of the twist arrangement around the inclination of the inclined film.

FIG. 12 is a schematic longitudinal sectional view of a general circular thickener.

FIG. 13 is a schematic plan view of a circular thickener using an inclined plate method.

FIG. 14 is a perspective view of an installation mode of a flexible gradient film.

[Explanation of symbols]

 Reference Signs List 3 liquid passage pipe 2 tank casing d undiluted solution 7 'inclined film 1 circular thickener 8, 8' support 71 inclined surface

Claims (3)

(57) [Claims] 1. A circular thickener in which a number of film-like flexible inclined films are obliquely provided with a small gap therebetween inside a circular tank casing having a liquid passage pipe installed in the center.
Each of the film-shaped inclined films has a weight at the lower edge and is suspended from the upper support through a lower support through a tension surface formed between the two supports. A circular thickener, wherein the inclined film is suspended in a circumferentially inclined manner so as to cross a plane passing through a center line of the liquid passage tube. 2. The apparatus according to claim 1, wherein at least one of said upper and lower supports is inclined in a circumferential direction with respect to a radial direction from a center line of said liquid passage tube. Circular thickener as described. 3. The circular thickener according to claim 1, wherein said inclined film is disposed so as to overlap in the circumferential direction from the liquid pipe side and from the tank casing side.